Power supply is making clicking noise when one of HDD turns off

dinko009

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Nov 1, 2015
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4,510
I recently upgraded PC with motherboard MSI B85M-G43 and i5 processor. I kept old case, power supply and disks. Now when my old non system HDD goes to sleep (turn's off) power supply start's making clicking sounds. I read on this forum that clicking noise is the PSU's voltage regulator repeatedly shutting off the power and turning it back on. I temporary fixed that with setting to prevent HDD from turning off. I don't really understand why turning off of HDD is making problem for power supply?